Final answer:
The 2009 study found that the biggest increase in media usage from childhood to early adolescence is attributed to video games and computers.
Step-by-step explanation:
According to a 2009 study, the largest increase in media use between childhood and early adolescence is due to video games and computers. The study highlighted that leisure activities are becoming more sedentary, which includes an increase in the use of computer games and web surfing. This shift towards digital entertainment aligns with the broader trends in media consumption, where technological advancements have greatly influenced how people, especially children and adolescents, engage with various forms of media.